1.1. A sound wave in air travels a distance of 220m in a time of 0.70s.

i) State the equation linking speed, distance and time.

[1]

ii) Calculate the speed of the sound wave in air.

wave speed = ..................................................... m/s[2]

1.2. Figure 2 shows water waves spreading out from a source.

A student measures the wavelength of the waves. He uses a ruler to measure the distance from one crest to the next crest.

Figure 2

Explain how to improve the student's method for measuring the wavelength.

1.3. Sound waves are longitudinal waves.

Water waves are transverse waves.

Describe the difference between longitudinal waves and transverse waves.